Wagons that can be attached with leashes

With the upcoming updates (Happy Ghast & Leash connection), I believe this is the perfect opportunity to introduce wagons. (Inspired by horse cart mod)

A wagon would be a wooden cart that can be pushed or pulled across land. They can be crafted by 5 wooden planks, and 2 wooden slabs, (making a boat with wheels), or alternatifly, 2 Wooden planks and 5 wooden slabs for the base. Can have wood variants.

Mobs and animals could enter it similarly to how they enter boats. Wagons would be designed for land travel, could feature an auto-jump mechanic to help navigate uneven terrain. Wagons should sink when entering water instead of floating, making them less effective for water travel. They can be ridden by the player but the player can't move with it.
Things to do with Wagons:

• Players could use leashes to pull the wagon themselves,
• Attach it to horses/donkeys/mules using leash, ride it for faster land transport,
• Wagons could carry either up to 2-4 mobs or 2-4 chest to contain item (I was thinking if more room would make it more functional). 
• Wagons could be leashed to the Happy Ghast for aerial transport, hoping it fits the intended purpose for the mob

I do hope this is something intresting to add, the goal is to an intresting method of transport that doesn't replace other vehicle( boats and minecarts), but why not a third options, Wagons! I hope this can fit into the minecraft vibe and not too modern.

Thank you for reading this suggestion.